It's impossible to make all baby products 'chemical free'. That's such a blanket statement. There are chemicals everywhere.
It hasn't been proven that BPA at the levels in normal bottles will harm your baby. But BPA bottles do leach BPA when sterilised or scratched. I'd rather Ash didn't ingest any of it if I can help it.
The BPA-free bottles are a bit more expensive than normal ones, but not too bad. Every type of plastic contains 'chemicals', that's what plastic is, a chemical, or many chemicals really.
I'm using Avent bottles at the moment and have been since Ash turned 6 months, so I do'nt think BPA is that bad otherwise I wouldn't be letting him feed from them.
I'm just considering swapping in the future.
K.xx